56661066601 has 4 divisors (see below), whose sum is σ = 56668522752. Its totient is φ = 56653610452.

The previous prime is 56661066563. The next prime is 56661066613. The reversal of 56661066601 is 10666016665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56661066601 - 2¹¹ = 56661064553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56661066661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3716665 + ... + 3731878.

It is an arithmetic number, because the mean of its divisors is an integer number (14167130688).

Almost surely, 2^56661066601 is an apocalyptic number.

It is an amenable number.

56661066601 is a deficient number, since it is larger than the sum of its proper divisors (7456151).

56661066601 is an equidigital number, since it uses as much as digits as its factorization.

56661066601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7456150.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 56661066601 in words is "fifty-six billion, six hundred sixty-one million, sixty-six thousand, six hundred one".